feat(telemetry): instrument file, prompt, selection and apply-edits tools

[cameroncooke]

Summary

Instruments the file / prompt / selection / apply-edits window tools.

Stack: 6/10 · depends on PR 2 · Refs GH-183

What this changes

• WorkspaceToolSentryTelemetry.swift (new) — shared helper for these providers.
• MCPFileToolProvider.swift (file.read, file.edit.apply), MCPApplyEditsToolProvider.swift, MCPPromptContextToolProvider.swift (prompt.render), MCPSelectionToolProvider.swift (selection.update) — span wrappers around existing work.

Business rules

• Records counts only (selection_file_count, result_count) and cache_hit.
• No path, name, file content, prompt text, or edit content is ever an attribute.

Key decisions

• A single shared helper keeps the four providers consistent and prevents any provider from inventing a non-allow-listed attribute.

Test plan

• Builds in both modes. ✅ verified.

[cameroncooke]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• build(telemetry): generate and upload dSYMs in the release pipeline #332
• feat(telemetry): instrument Codex runtime events and session persistence #331
• feat(telemetry): instrument Agent Mode run lifecycle #330
• feat(telemetry): instrument workspace actions #329
• feat(telemetry): instrument file, prompt, selection and apply-edits tools #328 👈 (View in Graphite)
• feat(telemetry): instrument context builder tool runs #327
• feat(telemetry): instrument MCP tool dispatch and bootstrap admission #326
• feat(telemetry): start telemetry and trace app launch #325
• feat(telemetry): add typed Sentry telemetry model and bootstrap #324
• build(telemetry): link Sentry conditionally and document privacy model #323
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.